Since the CI is running mysql in strict mode (T119371) the tests for this extension fails with:
Error: 1067 Invalid default value for 'Comment_Date'
The problem is '0000-00-00 00:00:00' as default value.
mediawiki/core is using varchars for timestamps
CREATE TABLE /*_*/Comments ( CommentID int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT, Comment_Page_ID int(11) NOT NULL default 0, Comment_user_id int(11) NOT NULL default 0, Comment_Username varchar(200) NOT NULL default '', Comment_Text text NOT NULL, Comment_Date datetime NOT NULL default '0000-00-00 00:00:00', Comment_Parent_ID int(11) NOT NULL default 0, Comment_IP varchar(45) NOT NULL default '' ) /*$wgDBTableOptions*/;